如何在Java中管理多线程？

Question

I have a Java function that is multi-threaded by OSB (oracle service BUs).      This Java function calling three different native function through JNI. How to      call     these three function in such a way that :

private static native void setup();

private static native String calculation(String input[],double y,int);

private static native void cleanup();

static{
     System.loadLibrary("CJavaInterface_64");
     taxcalc.setup();
     taxcalc.cleanup();
   }

input[j]=args[j];

BilledLines=Integer.ParseInt(args[7])；

Array=TaxCalc.Calculation（输入,y,BilledLines,）；

返回数组；

        System.out.println(taxoutput(args));

}

}

taxouput函数是OSB中的多线程函数。现在，我想调用setup()和
cleanup()，以便setup()只对第一个线程调用，而
cleanup()只对最后一个线程调用。